柴油机多环芳香烃类污染物的测量方法

摘要

采用聚四氟乙烯滤膜及XAD-2吸附管采集、超声和索氏提取、气-质联用(GC/MS)分析等方法对柴油机排气中多环芳香烃类污染物进行了定性、定量分析.结果表明,在试验浓度范围内,多环芳香烃(PAHs)各组分的浓度与峰面积的线性关系良好,线性相关系数在0.99以上.线性范围较宽,为0.0125～80μg/mL.该方法样品采集效率较高,样品提取效率均在95%以上.方法重复性较好,相对标准偏差低于15%,滤膜样品的回收率为70.1%～95.9%,吸附剂样品的回收率为77.0%～102.6%.灵敏度高,检出限在0.04μg/m3以下.该方法适用于柴油机排气中PAHs含量的快速分析.%The polycyclic aromatic hydrocarbons (PAHs) of diesel engine exhaust were measured by a method of using Teflon filter and XAD-2 collection, as well as ultrasonic extraction, Soxhlet extraction and GC-MS analysis.The results showed that concentration of different component in PAHs and the peak area had a good linear relationship in the experimental concentration range, and the linear correlation coefficient was above 0.99.Linear range was wider with 0.0125-80μg/mL.The method was more efficient for samples collection, and extraction efficiency was above 95％.The method had more repeatability, and relative standard deviation was less than 15％.Recoveries of filter samples were 70.1％-95.9％, the recoveries of adsorbent samples were 77.0％-102.6％.The method had higher sensitivity with minimum detection limit of 0.04 μg/m3, so it can be used for rapid analysis of PAHs content on diesel engine.